/*
 * Copyright 2010 Alessandro Bellucci
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.soupframework.gwt.designerpanel.client.command.impl;

import org.soupframework.gwt.designerpanel.client.command.Command;

public abstract class CommandBase implements Command {

	private boolean done = false;

	@Override
	public void doCommand(){
		if(done){
			throw new IllegalStateException("The command has already executed");
		}
		this.doCommandInt();
		this.done = true;
	}

	@Override
	public void undoCommand(){
		if(!done){
			throw new IllegalStateException("The command has not executed");
		}
		this.undoCommandInt();
		this.done = false;
	}

	public boolean isDone() {
		return this.done;
	}

	protected abstract void doCommandInt();
	protected abstract void undoCommandInt();
}
